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Police were called to the Pegasus Theatre at around 2.15pm on Wednesday and said they are treating his death as "unexplained but not suspicious".

Head of marketing at the arts centre Gill Jaggers said: "Most members of staff are in the office building right at the back. The police came and said something had happened and we were not to leave the building."

The theatre, set up in 1962, specialises in performing arts for young people, but also hosts conferences and other events.

A spokeswoman for Thames Valley Police said: "Officers are treating the death as unexplained but not suspicious."